Well, I say “inadvertently”, but no word on whether it was in fact so, or if it was intentional…or maybe Apple just doesn’t care enough to make sure it was functional for Mountain Lion, Mavericks, and Yosemite users (granted, Yosemite is still in beta). As it was foretold many months ago by messages from Apple itself, as of July 1, 2014, Apple was discontinuing support of iChat for AIM users with legacy IDs created with mac.com, me.com, or icloud.com addresses for versions of OS X (and iChat) earlier than 10.7.5. The support article regarding the change can be found on Apple’s web site.

The odds are in your favor as to being able to run OS X 10.10 Yosemite.

Per Computerworld, OS X Yosemite will run on about eight out of every ten Macs, a boon for customers who want to upgrade this fall.

OS X 10.10, aka Yosemite — named after the California national park — will support the same Macs as 2012’s Mountain Lion and 2013’s Mavericks, according to accounts of the Yosemite preview’s system requirements.

Earlier this week, Apple released an update to Safari bringing it up to version 7.0.3 for Mavericks and Safari 6.1.3 for Mountain Lion and Lion users. The updates are available through the OS X App Store application. You will need to quit Safari, if it is open, in order to complete the update. The following is the list of changes in the update:

Fixes an issue that could cause the search address field to load a webpage or send a search term before the return key is pressed

Improves credit card auto fill compatibility with websites

Fixes an issue that could block receipt of push notifications from websites

Adds a preference to turn off push notification prompts from websites

Adds support for webpages with generic top-level domains

Strengthens Safari sandboxing

Fixes security issues, including several identified in recent security competitions

Interesting to note is Apple’s nod to non-Apple sources for the security fixes, although the specify sources are not named.